Add a useful package (from Source forge) for octave

[CreaPhase.git] / octave_packages / geometry-1.5.0 / geom2d / orthogonalLine.m

diff --git a/octave_packages/geometry-1.5.0/geom2d/orthogonalLine.m b/octave_packages/geometry-1.5.0/geom2d/orthogonalLine.m
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+++ b/octave_packages/geometry-1.5.0/geom2d/orthogonalLine.m
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+%% Copyright (c) 2011, INRA
+%% 2003-2011, David Legland <david.legland@grignon.inra.fr>
+%% 2011 Adapted to Octave by Juan Pablo Carbajal <carbajal@ifi.uzh.ch>
+%%
+%% All rights reserved.
+%% (simplified BSD License)
+%%
+%% Redistribution and use in source and binary forms, with or without
+%% modification, are permitted provided that the following conditions are met:
+%%
+%% 1. Redistributions of source code must retain the above copyright notice, this
+%%    list of conditions and the following disclaimer.
+%%     
+%% 2. Redistributions in binary form must reproduce the above copyright notice, 
+%%    this list of conditions and the following disclaimer in the documentation
+%%    and/or other materials provided with the distribution.
+%%
+%% THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+%% AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+%% IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+%% ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+%% LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
+%% CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+%% SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
+%% INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+%% CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+%% ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+%% POSSIBILITY OF SUCH DAMAGE.
+%%
+%% The views and conclusions contained in the software and documentation are
+%% those of the authors and should not be interpreted as representing official
+%% policies, either expressed or implied, of copyright holder.
+
+%% -*- texinfo -*-
+%% @deftypefn {Function File} {@var{perp} = } orthogonalLine (@var{line}, @var{point})
+%% Create a line orthogonal to another one.
+%
+%   Returns the line orthogonal to the line @var{line} and going through the
+%   point given by @var{point}. Directed angle from @var{line} to @var{perp} is pi/2.
+%   @var{line} is given as [x0 y0 dx dy] and @var{point} is [xp yp].
+%
+%   @seealso{lines2d, parallelLine}
+%% @end deftypefn
+
+function res = orthogonalLine(line, point)
+
+  N = max(size(point, 1), size(line, 1));
+
+  if size(point, 1)>1
+      res = point;
+  else
+      res = ones(N, 1)*point;
+  end
+
+  if size(line, 1)>1
+      res(:,3) = -line(:,4);
+      res(:,4) = line(:,3);
+  else
+      res(:,3) = -ones(N,1)*line(4);
+      res(:,4) = ones(N,1)*line(3);
+  end
+
+endfunction
+